Effect

Generation I

Twineedle inflicts damage, hitting the target twice per use. Each strike has a 20% chance of poisoning the target, unless the target is Poison-type. Although only the first strike can be a critical hit, the second one will deal the same amount of damage.

Twineedle will end immediately if the first strike breaks a substitute. Bide and Counter will only acknowledge the second strike of this move.

Generation II

Each strike now does damage independently, consequently enabling either of them to be critical.

Generations III and IV

Twineedle will now hit again if the first strike breaks a substitute.

Twineedle can no longer poison Poison- or Steel-type Pokémon.

Generation V

If the first strike activates the target's Focus Sash, Focus Band, or Sturdy, the second one will cause the defending Pokémon to faint. A Focus Band can still activate again to prevent fainting, but this chance is independent of the previous one.

In other games

Table assumes the user is in the square marked by > facing to the right.Orange squares indicate spaces that are hit.Red squares indicate the knockback on hit Pokémon.A blue square indicates the user's position after performing the move.

★★

Power = 26 | Accuracy = 100% | Effect = Hits twice and has a 20% chance of poisoning each target with each hit.